Replace handwritten testService stub by the generated one
diff --git a/src/csharp/Grpc.IntegrationTesting/TestServiceImpl.cs b/src/csharp/Grpc.IntegrationTesting/TestServiceImpl.cs
index 40f32b5..d6ba61ef 100644
--- a/src/csharp/Grpc.IntegrationTesting/TestServiceImpl.cs
+++ b/src/csharp/Grpc.IntegrationTesting/TestServiceImpl.cs
@@ -44,7 +44,7 @@
     /// <summary>
     /// Implementation of TestService server
     /// </summary>
-    public class TestServiceImpl : TestServiceGrpc.ITestService
+    public class TestServiceImpl : TestService.ITestService
     {
         public Task<Empty> EmptyCall(ServerCallContext context, Empty request)
         {